INROCK stocks the largest inventory of HDD crossover subs in the world. All subs are manufactured by INROCK by API standards including full material certification and quality assurance.
Large Rig Crossover Subs (4 1/2″ IF – 6 5/8″ connections) require “neckdown” transition zones for minimum drilling strength.
API/Vermeer®/Jet Trac®/CASE®/PH6 and more.
Most of our subs are always in stock and available for immediate delivery. Overnight delivery available on many not-in-stock subs. All connections are cut to strict tolerance using certified hardened and ground gauges. Machined from heat-treated 4140 alloy for superior strength and durability.
INROCK® also offers Non-Magnetic orientation subs for magnetic guidance services. Sizes range from 4 1/8″ to 8″ Orientation Subs.